It is a Prime number and its factors are 43 and 1
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They are 1, 13, 43 and 559.
The prime numbers between 43 and 53 are 47 and 53.
Itself because 43 is a prime number
3 43
All multiples of 43 (which are infinite) including 43, 86, 129, 172, 215 . . .